EASTMAN: CAKBONIFEROUS FISHES FROM THE CENTRAL WKST. 223 



Fig. 9. Cladodus occidentalis Leidy. Atcliison shales (Missourian) ; Springfield, 

 Sarpy County, Nebraska. Fragmentary basal portion viewed from the 

 inner face, with lateral denticles preserved on one side, and showing 

 prominent nutrient foramina of root. 

 Fig. 10. Ctenoptycldus occidentalis (St. J. and Worth.). Atchison shales (Missou- 

 rian) ; Richfield, Sarpy County, Nebraska. Outer coronal face of a 

 weathered specimen, the root broken away. 

 Fig. 11. Fissodus inaeqaalis (St. J. and Wurtii.). Atchison shales (Missourian) ; 

 Peru, Nemaha County, Nebraska. Inner coronal face of same specimen 

 as shown in Plate 3, Fig. 26. 

 Fig. 12. Fissodus dentatus, sp. nov. Missourian ; Topeka. Kansas. Outer coronal 

 face of tooth, the root broken away. Marks of contact with next older 

 tooth are distinctly shown, serrations of lateral edges but faintly, in the 

 photograph. 

 Fig. 13. Janassa unguicula, sp. nov. Atchison shales (Missourian) ; Cedar Creek, 

 Cass County, Nebraska. Outer coronal face of tooth, tlie root broken 

 away. The portion overlapped by ne.xt older tooth in front is in- 

 dicated by the darker area at the base of crown. 

 Fig. 14. Helodus rwjosus Newb. and Worth. Base of Cottonwood or summit of 

 Atchison shales (Missourian); Table Rock, Pawnee County, Nebraska. 

 Inner face of nearly perfect tooth. 

 Fig. 15. Campodus variabilis (Newb. and Worth ). Neosho formation (Permo- 

 Carboniferous) ; Roea, Lancaster County, Nebraska. Coronal surface 

 of supposed postero-lateral tooth, differing somewiiat from any de- 

 scribed by St. John and Worthen. 

 Fig. 16. Campodus variabilis (Newb. and Worth.). Atchison sliales (Missourian) ; 

 Louisville, Cass County, Nebraska. Coronal surface of a shghtly 

 asymmetrical tooth with feebly developed buttresses along the outer 

 margin, and most nearly agreeing witli the tooth figured by St. John 

 and Worthen in PI. VIII., Fig. 4, of the sixth volume of the Illinois 

 Palaeontology. 

 Fig. 17. Petalodus alleghaniensis Leidy. Atchison shales (Missourian); South 

 Bend, Cass County, Nebraska. Anterior (outer) face of a broad-rooted 

 and symmetrical tooth presumably situated in the azygous series in 

 front. The opposite face of the same specimen is shown in Plate 3, 

 Fig. 27. 

 Fig. 18. Petalodus alleghaniensis Leidy. Base of Cottonwood or summit of 

 Atchison shales (Missourian); Table Rock, Pawnee County, Nebraska. 

 Posterior aspect of fragmentary specimen showing difference in form 

 of root as compared with teeth occupying a position in the median 

 azygous in front. 

 Fig. 19. Deltodus angularis Newb. and Worth. Permo-Carboniferous ; Blue Springs, 

 Gage County, Nebraska. Coronal surface of posterior dental plate 

 referred to the riglit mandibular ramus. 

 Fig. 20. Streblodus angustus, sp. nov. Atchison shales (Missourian); South Bend, 

 Cass County, Nebraska. Coronal surface of posterior dental plate re- 

 ferred to the left ramus of the upper jaw. 

 Fig. 21. Janassa maxima, sp. nov. Atchison shales (Missourian) ; Richfield, Sarpy 

 County, Nebraska. Posterior (inner) coronal face of a fractured and 



